![]() There are no significant differences in SNR between decoders: Streams were decoded with the help of three decoders (i wasn't able to test Sonic because it always increases the level of PCM). Source test6.wav (each channel is packed with a 0 dB, action-scene from the movie) was encoded to E-AC3 384, 7 kbps ( download all streams). There are serious differences in SNR between libavcodec and Nero, Sonic. | SNR(FC) | SNR(FL) | SNR(FR) | SNR(SL) | SNR(SR) | SNR (LFE) Time-frequency spectrograms: Graphs test5.Average frequency spectrograms: Graphs test5.Results are shown in the example FC-channel, for other speakers all the same. (I wasn't able to test ArcSoft and Cyberlink because I could not turn off the forced mixing to 2.0 inside DS-filter). Streams were decoded with the help of four decoders Source test5.wav was encoded to E-AC3 1536 kbps ( download all streams). In case of 640 kbps we have significant differences in SNR between libavcodec and others: Again all decoders have the same frequency response (too many screenshots → don't show) Streams were decoded with the help of all decoders. Source test2.wav was encoded to E-AC3 192, 320 and 640 kbps ( download all streams). There are some differences in SNR for FR-channel between libavcodec and other decoders. All decoders have the same frequency response. ![]() Time-frequency spectrograms: Graphs test1.Average frequency spectrograms: Graphs test1.Source test1.wav (stereo) was encoded to E-AC3 1536 kbps and then was decoded. SNR measurement (bigger is better) - CompAudio Nero, CyberLink, Sonic and ArcSoft manufactures has been licensed by Dolby Laboratories. Decoder is taken from "ArcSoft TotalMedia Theatre 3.0.1.190". DirectShow' graph: "LAV Splitter → ArcSoft Audio Decoder HD → Wav Dest → File Writer" was built in GraphEdit. To be able to compare the WAV with the others,Īfter each decoding level accounted for accurately calculate and understate, it was done very accurately using CopyAudio. Decoder has a feature: it always increases the amplitude in ~1,5 times (i.e. Decoder is taken from "Sonic Audio Decoder (4.3.0.169)". DirectShow's graph: "File Source (Async.) → Sonic HD Demuxer → Sonic Cinemaster Audio Decoder 4.3.0 → Wav Dest → File Writer" was built in GraphEdit. I could not turn off the forced mixing to 2.0 inside DS-filter. Decoder is taken from "PowerDVD 10 Mark II. DirectShow's graph: "LAV Splitter → CyberLink Audio Decoder (PDVD10) → Wav Dest → File Writer" was built in GraphEdit. Output is represented in 24-bit int (default). Output can be represented in 16-bit int only.įfmpeg -drc_scale 0 -i input.ec3 output.wav Output is represented in 24-bit int (default).Įac3to input.ec3 output.wavs -libav -no2ndpass Preprocessing was disabled, DRC="none", DN=-31dB, target="Standard". Code: Encoding WAV (PCM) to E-AC3 - Dolby® Media Encoder SE v1.3.8 (from Dolby Media Producer Suite).
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